Plate Tectonics

Question 1

Pangaea

Answer 1

the hypothetical landmass that existed when all continents were joined, from about 300 to 200 million years ago.

Question 2

Mid-ocean ridge

Answer 2

any of several seismically active submarine mountain ranges that extend through the Atlantic, Indian, and South Pacific oceans: each is hypothesized to be the locus of seafloor spreading.

Question 3

Convection

Answer 3

Physics. the transfer of heat by the circulation or movement of the heated parts of a liquid or gas.

Question 4

Convection current

Answer 4

A circulation pattern in which materials is heated and rises in one area, then cools and sinks in another area, flowing in continuous loop.

Question 5

Theory of plate tectonics

Answer 5

A theory stating that Earths lithosphere is broken into huge plates that move and change in size over time.

Question 6

Continental drift

Answer 6

The hypothesis that Earth’s continents move on Earth’s surface.